Hey, I've been kicking myself to be productive around here, so I decided to post one of my tips & tricks
When I listen to music, I have memories of previous times I've heard the song. So for instance, whenever I hear Harry Chapin's "Cat's in the Cradle", I remember the time i was learning to play the song on the bass in a ski chalet in the Green Mountains. When I hear Bob Seger's "Night Moves", I remember the time I got hit in the eye with a tennis ball walking along the park listening to the song on my iPod. I've discovered that listening to the music, instrumental or not because some say lyrics are detrimental to focus, while visualizing makes it a lot easier to visualize the scene. My on-and-off wonderland is a treehouse in the middle of the White Mountains, so it's pretty close to what I get when I listen to "Cat's in the Cradle".
Of course, my experiences are only with my memories, but it might be open to have the music as a cue for visualizing other things. You could play Jethro Tull's "Aqualung" whenever you draw your wonderland, and it could theoretically help you visualize your drawing when you play "Aqualung" in the future.
This seems to pretty much explain it, even though it focuses on Alzheimer's. The same principles still apply.